Inverted Channels North of Juventae Chasma
NASA/JPL/University of Arizona

Inverted Channels North of Juventae Chasma
PSP_006770_1760  Science Theme: Geologic Contacts/Stratigraphy



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This image shows raised ridges on a plain to the north of Juventae Chasma. Juventae Chasma, a canyon that is part of the Valles Marineris system, stretches for 180 kilometers (110 miles) east-west and 250 km (155 mi) north-south. Several examples of raised features have been identified on the plains near this canyon.

The raised ridges in this image (see subimage) have been explained as former stream channels that are now preserved in inverted relief. On Earth, inverted relief occurs when former depressions become elevated because materials that fill the depressions are more resistant to erosion than the surrounding terrain. For example, a depression may become filled with lava that is more resistant to erosion than the surrounding surface; gravel or boulders transported in a high energy flow protect underlying material from erosion, or sediments deposited by a flowing stream become cemented.

In this location, it is most likely that water, pure or salt water, once flowed through these channels and deposited sediments that eventually filled the channels and became cemented by some chemical precipitating from the flowing water. Over time, wind eroded the surrounding surface leaving the remnant channels exposed as raised ridges.Written by: Maria Banks   (24 February 2008)

This is a stereo pair with PSP_006981_1760.

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Acquisition date:05 January 2008 Local Mars time: 2:30 PM
Latitude (centered):-4.170° Longitude (East):296.847°
Range to target site:265.3 km (165.8 miles)Original image scale range:26.5 cm/pixel (with 1 x 1 binning) so objects ~80 cm across are resolved
Map projected scale:25 cm/pixel and North is upMap projection:Equirectangular
Emission angle:7.5° Phase angle:45.9°
Solar incidence angle:39°, with the Sun about 51° above the horizon Solar longitude:13.4°, Northern Spring
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North azimuth:97° Sub-solar azimuth:19.7°
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North azimuth:270°Sub solar azimuth:194.2°

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For information about NASA and agency programs on the Web, visit: http://www.nasa.gov. NASA's Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, Calif., manages the Mars Reconnaissance Orbiter for NASA's Science Mission Directorate, Washington. Lockheed Martin Space Systems is the prime contractor for the project and built the spacecraft. The HiRISE camera was built by Ball Aerospace and Technology Corporation and is operated by the University of Arizona. The image data were processed using the U.S. Geological Survey’s ISIS3 software.